CN1755814A - Optical disc and optical disc device - Google Patents
Optical disc and optical disc device Download PDFInfo
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- CN1755814A CN1755814A CNA2005100845668A CN200510084566A CN1755814A CN 1755814 A CN1755814 A CN 1755814A CN A2005100845668 A CNA2005100845668 A CN A2005100845668A CN 200510084566 A CN200510084566 A CN 200510084566A CN 1755814 A CN1755814 A CN 1755814A
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
- G11B7/24073—Tracks
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
- G11B7/24035—Recording layers
- G11B7/24038—Multiple laminated recording layers
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- Optical Head (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
Abstract
A single-sided dual-layer optical disc comprising an optically transparent layer; a first recording layer accessed by a first laser beam; an intermediate layer; and a second recording layer accessed by a second laser beam, wherein the optically transparent layer, the first recording layer, the intermediate layer, and the second recording layer are sequentially disposed in a laser beam incidence direction, wherein a thickness of the optically transparent layer, which is a distance from a light incident surface to the first recording layer, is 550 to 575 m, wherein a thickness of the intermediate layer, which is a distance between the first and second recording layers, is 29 to 47 m, and wherein a surface recording density of the second recording layer is at least 3 times that of the first recording layer.
Description
The cross reference of related application
The application requires the right of priority of the 2004-279847 Japanese patent application of submission on September 27th, 2004, and its content is incorporated herein by reference.
Technical field
The present invention relates to a kind of CD such as DVD, as the storage medium such as film and music such as digital audio-video works.In addition, the invention still further relates to a kind of compact disk equipment, it reads the information that writes down on the CD.
Background technology
The general introduction of=dvd standard=
Just as is generally known, DVD (digital omnipotent dish) is as the CD of storage digitized video.Described DVD is extensive use of with having spread all over the world, is mainly used in storage and distribution movie contents (publication of digital product).This DVD is a kind of standard that DVD forum makes, discloses (seeing www.dvdforum.org) as dvd standard (DVD book), and by ISO (International Standards Organization) and JIS regulation.Will be at this according to the international standard of 120mm DVD-ROM, ISO/IEC16448 (one of DVD physical criterion) provides brief description.
With regard to described 120mm DVD-ROM, have four types disc, comprise the single face specification of single-recordng-layer, the single face specification of double record layer, the two-sided specification of single-recordng-layer and the two-sided specification of double record layer.For the storage and issued content such as film, mainly use described two class single face specifications.With regard to CD capacity, the single-surface single-layer CD has the capacity of 4.7GB, and single-side double-layer light disk has the capacity (every CD 8.54GB) of 4.27GB on every layer.
=single-surface single-layer DVD=
Fig. 1 has shown the basic structure of single-surface single-layer DVD CD 10 and the relation between the shaven head.As everyone knows, in the structure of described DVD CD 10, two compact disc substrates are bonding mutually, and each thickness is 0.6mm, and one of described substrate is a signal substrate 11, and another is blank substrate 14.Described two substrates utilize adhesion layer 24 bonding mutually, so that recording layer 20 is placed therebetween.Usually, make these substrates by the plastic material that is called polycarbonate by using injector.
Notice that image information, data message etc. are recorded on the helical orbit of described signal substrate 11 with the form of punching press pit.Read the red laser 30 (wavelength: 650nm) converged, and focus on the described recording layer 20 of information by the photic zone 13 in the described signal substrate 11 by object lens 35 (NA:0.6) at described recording layer.
Each width of cloth has all shown the position of described recording layer when the plane of incidence 12 of described single-surface single-layer CD is observed among Fig. 2 A and the 2B.Fig. 2 A has shown the situation of the normal individual layer of conventional use, and the central value of wherein said photic zone 13 thickness is 600 μ m, and the distance of the described recording layer and the described plane of incidence is in 570 μ m to 630 mu m ranges.Considered the spherical aberration of described object lens 35 when setting this value.In the situation of single-surface single-layer CD, if situation is shown in Fig. 2 B, the central value that meets described photic zone 13 thickness is 565 μ m, and the distance of the described recording layer and the described plane of incidence is in 550 μ m to 580 mu m ranges, and the situation that this situation has added thin individual layer recently becomes dvd standard (seeing www.dvdforum.org or DVD book).
=single-surface double-layer DVD=
Fig. 3 has shown the basic structure of single-surface double-layer DVD CD 15 and the relation between the shaven head.As everyone knows, this CD comprises first recording layer 21 and second recording layer 23.These two recording layers all are the one side accesses from described CD, and can reproducing signal.As shown in Figure 3, when from plane of light incidence 17 observations, on the another side of photic zone 18, described first recording layer 21 is in nearer position, and described second recording layer 23 is in position far away.By making lens drive device move object lens 35,, thereby realized the access of described each recording layer so described object lens 35 can carry out the interlayer jump.
The manufacturing of above-mentioned double-layer CD has a principal character: make described CD mode can with make described single-surface single-layer CD much at one.At first,, be ready to signal substrate 16 and signal substrate 19 respectively, on the former, form described first recording layer 21, on the latter, form described second recording layer 23 by using injector.Next step adheres to semitransparent thin film at described first recording layer 21, adheres to high reflectivity film at described second recording layer 23.After this, described two substrates utilize middle layer 25 bonding mutually towards interior mode with described recording layer.Therefore finished the manufacturing of described single-side double-layer light disk.
The position of described recording layer when Fig. 4 has shown from the plane of incidence 17 observations of described single-side double-layer light disk.Consider crosstalking between the spherical aberration of described object lens and the described recording layer, the position of described first recording layer 21 is subjected to following restriction: with the described plane of incidence be 550 μ m apart from minimum, the position of described second recording layer 23 is subjected to following restriction: be 640 μ m to the maximum with the distance of the described plane of incidence.In addition, described distance (thickness in described middle layer 25) between two-layer is restricted to 55 μ m ± 15 μ m (comprising two ends to 70 μ m from 40 μ m).The thickness in this middle layer 25 is generally when the mutual adhesion layer thickness that forms when bonding of described two substrates.In actual manufacture process, considered the bonding precision and the injection molding precision of described signal substrate 16 when determining the thickness in described middle layer 25.
Reflectivity of=recording layer or the like=
At this moment, the reflectivity of recording layer is determined as follows.
Single-layer optical disc: 45-85% (PBS is arranged) or 60-85% (not having PBS), circularly polarized light.
Double-layer CD: 18-30% (PBS is arranged) or 18-30% (not having PBS), circularly polarized light.
In addition, the information of indication CD reflectivity is arranged among the Frame 4 byte ID (identification data) the 29th.At this,
0b: described reflectivity is greater than 40% situation (PBS is arranged)
1b: described reflectivity is less than or equal to 40% situation (PBS is arranged) except described above situation, and described ID also comprises following situation.
Area type: 27-26 position
00b is in the data field
01b is at Lead-In Area
10b is at leading-out zone
11b is in the mesozone
Data type: the 25th
The 0b read-only data
The non-read-only data of 1b
Level number: the 24th
The layer 0 or the single-layer optical disc of 0b double-layer CD
The layer 1 of 1b double-layer CD
In addition, comprise one deck or two-layer information, defined compact disk structure by (BP2) in the control data territory, and the 6-5 position has shown the number of recording layer as for the indication CD.
The 00b individual layer
The 01b bilayer
Other: keep
Moreover, the capacity difference of each layer between single-layer optical disc and the double-layer CD.This is because due to the difference in the line recording density.Described recording density defines in (BP3), and the 7-4 position shows that described line recording density is as follows.
0000b:0.267 μ m (single-layer optical disc line recording density)
0001b:0.293 μ m (double-layer CD line recording density)
=DVD=of future generation
Simultaneously, as nearest extensive propaganda,, it was suggested HD DVD in order to satisfy the demand of on a CD, storing HD (high definition) image, by using bluish violet semiconductor laser (hereinafter being referred to as bluish violet color laser), its density increases to three times of DVD density at least.In addition, www.dvdforum.org (sees to the standardization of described HD DVD is underway in described DVD forum.Described HD DVD not commercialization as yet.)
The compact disk structure of described HD DVD is identical with conventional DVD.As for its capacity, the single-surface single-layer CD has the capacity of 15GB, and two-sided double-layer CD has the capacity of 30GB.These high capacity are realized by new technology, handle (PRML: partial response and maximum likelihood) such as the wavelength that shortens laser beam, increase NA, improvement modulator approach and new signal.
Fig. 5 has shown the basic structure of single-surface double-layer HD DVD CD 40 and the relation between the shaven head.Described HD DVD has different spherical aberrations, different inclination comatic aberration etc.This is owing to the laser beam 60 of the breath of winning the confidence from described optical disk reading, foreshorten to bluish violet color laser bundle (405nm) from red laser beam (650nm), and the NA of object lens 65 increases to 0.65 from 0.6.Therefore, actual HD DVD CD is compared with DVD, and the position of first recording layer 51 and second recording layer 53, the thickness in middle layer 55 etc. are different slightly.
The position of the described recording layer of described single-surface double-layer HD DVD CD when Fig. 6 has shown from the plane of incidence 46 observations.Along with described wavelength decreases and described NA increase, described spherical aberration becomes even more serious.Therefore, the position limit of described first recording layer 51 is within the scope of 578 μ m to 622 μ m.Described distance (thickness in described middle layer 55) between two-layer is set to 20 μ m ± 5 μ m (15 μ m to 25 μ m).
=existing DVD and DVD of future generation=
As mentioned above, it was suggested the high power capacity HD DVD that can store the HD image.For the newly-designed HD DVD of described HD DVD equipment (driver or player) can be designed to not only read HD DVD CD, and can read the DVD CD.Yet mass parts such as the recording density of described HDDVD, modulator approach, signal Processing, track format are different from described DVD.Therefore, use conventional DVD equipment (driver or player) can't read described HD DVD.Exactly, the problem of described conventional DVD equipment is, not only can not read the HD movie contents that writes down on the described HD DVD CD, can not read conventional DVD movie contents.So described problem has become the factor that described HD DVD popularizes that hinders.
Summary of the invention
Consider the problems referred to above, a target of the present invention is to make a slice CD can either store HD DVD information can store DVD information again.
CD according to one aspect of the invention comprises photic zone; First recording layer by the first laser beam access; The middle layer; And by second recording layer of the second laser beam access, wherein said photic zone, described first recording layer, described middle layer and described second recording layer are sequentially arranged on the laser beam incident direction, described euphotic thickness, i.e. distance from plane of light incidence to described first recording layer, be 550 μ m to 575 μ m, the thickness in described middle layer, it is the distance between described first and second recording layers, be 29 to 47 μ m, the area recording density of described second recording layer is three times of the described first recording layer area recording density at least.
According to one aspect of the invention, reading and recording compact disk equipment of information on CD comprises shaven head, is configured to produce first laser beam and second laser beam; And controller, be configured to make described shaven head optionally to produce any in described first laser beam and described second laser beam, wherein said CD has photic zone, first recording layer by the described first laser beam access, middle layer and by second recording layer of the described second laser beam access, described photic zone, described first recording layer, described middle layer and described second recording layer are sequentially arranged on the laser beam incident direction, described euphotic thickness, i.e. distance from plane of light incidence to described first recording layer, be 550 μ m to 575 μ m, the thickness in described middle layer, it is the distance between described first and second recording layers, be 29 to 47 μ m, the area recording density of described second recording layer is three times of the described first recording layer area recording density at least.
According to the present invention, a kind of CD may be provided, wherein from the one side of described CD, can be by first laser beam (red laser) access, first recording layer (being equivalent to the DVD layer), and can be by second laser beam (bluish violet color laser) access, second recording layer (being equivalent to HD DVD layer).Therefore, DVD movie contents and HD DVD movie contents can both be stored in a slice CD.Exactly, described CD becomes a kind of combination optical disc, can store the SD image and also can store the HD image.
Therefore, the compact disk equipment of conventional DVD compatibility reproduces dvd content.The compact disk equipment of new HD DVD compatibility can reproduce the HD dvd content, perhaps can either reproduce HD DVD and also can reproduce the DVD movie contents.
For example, if identical film is prepared as dvd content and HD dvd content, they all are stored in a slice CD, and the user who so only has DVD compatibility CD-disc equipment can watch described DVD movie contents.And the user with HD DVD compatibility CD-disc equipment can watch described HD DVD movie contents.
Even there is not the user of described HD DVD compatibility CD-disc equipment at present,, also can appreciates the HD image by enough CDs that he has bought, and need not newly buy HD DVD CD if he is buying described HD DVD compatibility CD-disc equipment in the future.Therefore, the present invention provides huge interests for described user.
Read the explanation of this instructions with reference to the accompanying drawings, the present invention will become very clear with last other different characteristics and purpose.
Brief Description Of Drawings
For a more complete understanding of the present invention and advantage, now together with accompanying drawing with reference to the following description, wherein:
Fig. 1 has shown the basic structure of single-surface single-layer DVD CD and the relation between the shaven head;
Fig. 2 A has shown under the normal individual layer situation position of recording layer in described single-surface single-layer DVD CD;
Fig. 2 B has shown under the thin individual layer situation position of recording layer in described single-surface single-layer DVD CD;
Fig. 3 has shown the basic structure of single-surface double-layer DVD CD and the relation between the shaven head;
Fig. 4 has shown the position of two recording layers in described single-surface double-layer DVD CD;
Fig. 5 has shown the basic structure of single-surface double-layer HD DVD CD and the relation between the shaven head;
Fig. 6 has shown the position of two recording layers in described single-surface double-layer HD DVD CD;
Fig. 7 has shown according to the CD of the embodiment of the invention and the relation between the reproduction optical system;
Fig. 8 has shown according to the described CD of the embodiment of the invention and the relation between the red laser beam;
Fig. 9 has shown according to the described CD of the embodiment of the invention and the relation between the bluish violet color laser bundle;
Figure 10 is the block diagram of dvd standard compact disk equipment;
Figure 11 A and Figure 11 B have shown the operating process that the described compact disk equipment of described dvd standard is carried out;
Figure 12 is the block diagram of HD dvd standard compact disk equipment;
Figure 13 A and Figure 13 B have shown the operating process that the described compact disk equipment of described HD dvd standard is carried out;
Figure 14 is the compact disk equipment block diagram according to the embodiment of the invention;
Figure 15 has shown the operating process that described according to an embodiment of the invention compact disk equipment is carried out.
Embodiment
By the explanation in this instructions and the accompanying drawing, clarify following item to the major general.
The basic structure of=CD=
Fig. 7 has shown according to one embodiment of present invention, the relation between CD 70 and the shaven head.Described CD 70 is made up of first substrate 71 and second substrate 72.First recording layer (being equivalent to the DVD layer) 81 by the translucent thin film production forms on the plane of incidence 73 one sides near laser beam, and second recording layer of being made by high reflectivity film (being equivalent to HD DVD layer) 83 forms on the another side away from the described plane of incidence 73.
Fig. 8 has shown by using red laser beam 30 to reproduce 81 o'clock situation of described first recording layer (DVD layer).Fig. 9 has shown by using bluish violet color laser bundle 65 to reproduce 83 o'clock situation of described second recording layer (HD DVD layer).At first, in order to use the described HD DVD of described bluish violet color laser Shu Zaixian layer 83, with reference to figure 6, described HD DVD layer 83 must be positioned within the distance scope of the described plane of incidence 578 μ m to 622 μ m (comprising two ends) (spherical aberration limit).In addition, under the thin individual layer situation shown in Fig. 2 B, described DVD layer 81 must be positioned at (minimum value 550 μ m are spherical aberration limits) within the distance scope of the described plane of incidence 550 μ m to 580 μ m (comprising two ends).That has considered when simultaneously, determining the thickness in middle layer 85 to cause between described DVD layer 81 and the described HD DVD layer 83 crosstalks.Under the situation of HDDVD, its thickness is not less than 15 μ m, is 40 μ m under the situation of DVD.Yet in either case, its thickness all depends on optical system.
Formed described DVD layer 81 in described first substrate 71, and the described bluish violet color laser bundle that reproduces described HDDVD layer 83 is seen through.So, consider the injection molding precision of this substrate, the thickness setting of photic zone 87 is the scope of 550 μ m to 575 μ m (comprising two ends).Specifically, described DVD layer 81 is positioned at the described plane of incidence 73 of distance within the scope of 550 μ m to 575 μ m.The injection molding ratio of precision of ± 12.5 μ m under thin individual layer situation ± 15 μ m are stricter, but than under described HD DVD (maximal value in described middle layer is under the situation of 25 μ m) situation ± 9.5 μ m are loose.
Consider that described HD DVD layer 83 must be positioned within the distance scope of the described plane of incidence 578 μ m to 622 μ m (comprising two ends), the thickness in described middle layer 85 is from minimum value: 578 μ m-550 μ m=28 μ m are within the scope of maximal value 622 μ m-575 μ m=47 μ m.The maximal value in described middle layer 85 is along with the injection molding precision of described DVD signal substrate 71 improves and increases.Otherwise if described injection molding precision reduces, its described maximal value reduces.
=reflectivity or the like=
Secondly, in the conventional DVD equipment of having introduced to the market on a large scale, in order to be the thin single-layer optical disc of single face to above-mentioned optical disc recognition, as shown in Figure 8, must be from the flashlight Irs of described DVD layer 81 more than or equal to 45% of described red laser beam 30.Simultaneously, under situation about bluish violet color laser bundle 60 being shone on the same CD, as shown in Figure 9, must restraint light focusing and obey tracking servo by this from the flashlight Ibs of described HDDVD layer 83, and must can reproducing signal.
Described HD dvd standard is as follows about the reflectivity regulation of described bluish violet color laser bundle.
Under the situation of HD DVD-ROM,
The single-surface single-layer CD:
40% to 70% (comprising birefringence)
Single-side double-layer light disk:
18% to 32% (comprising birefringence)
Under the situation that can rewrite HD DVD (Lead-In Area) in system,
The single-surface single-layer CD:
4% to 8% (comprising birefringence)
Under described CD situation of the present invention, described HD DVD is placed on and the identical position of described single-surface double-layer HD DVD-ROM CD.Therefore under the preferable case, described reflectivity is within the scope of this regulation.Yet, as for the described HD DVD layer of this CD, because described HD DVD not commercialization as yet just can comprise new regulation in described HD dvd standard.In this case, the lower limit of described reflectivity need be greater than the lower limit of described CD-RW.
Under described single-surface double-layer DVD CD situation shown in Figure 4, playback light is described red laser beam 30.Therefore, use the semitransparent thin film as described first recording layer 21 such as Au, Si usually, and use cheap Al alloy to make described second recording layer 23, it is described high reflectivity film.
Yet, under described HD DVD situation shown in Figure 6,, be difficult within appropriate scope, form semitransparent layer for described bluish violet color laser bundle if use Au or Si.Therefore, use the Ag alloy to make the described semitransparent layer of described first recording layer 51 recently, use Ag alloy, Al alloy etc. to make the described high reflectivity film of described second recording layer 53.
Following with situation about introducing under, the DVD layer of described CD 70 (described semitransparent thin film) 51 is formed by the Ag alloy, its described HD DVD layer (described high reflectivity film) 53 is formed by the Al alloy.
Fig. 8 has shown makes described red laser beam 30 incide the situation of described CD 70.According to the refractive index of 71 pairs of described red laser beams 30 of described first substrate, the reflectivity of the described plane of incidence (Rrs) is set to 4.8% (no anti-reflection film).Described photic zone 87 also is used as the photic zone of described HD DVD layer.Therefore, if birefringence is the round trip of 60nm, by the amplitude height to 8.2% of described birefringence minimizing.So in order to make described flashlight Irs from described DVD layer 81 more than or equal to 45% of described incident light Ir, the reflectivity Rr1 of described DVD layer is 54% (=45%/(0.952
2* 0.918)).
Secondly, the transmission coefficient of 51 pairs of described red laser beam 30 of described translucent DVD layer is 46% (when Rr1 is 54%), and the reflectivity of the described HD DVD layer 53 of the described high reflectivity film that is formed by the Al alloy is 85%.Therefore, the noise light Irn from described HD DVD layer 53 is 15% (=0.952 of described incident light Ir
2* 0.918 * 0.46
2* 0.85 * 100%).This value is approximately half of described single-surface double-layer DVD CD value shown in Figure 4.
Next step, Fig. 9 has shown makes described bluish violet color laser bundle 65 incide the situation of described CD 70.The reflectivity (Rbs) of described bluish violet color laser bundle 65 on the described plane of incidence is 5.6%, the amplitude height to 20% (round trip of 60nm) that described photic zone 87 is reduced by birefringence, and the reflectivity Rb1 of described translucent DVD layer is 48.2%.Therefore, the transmission coefficient of described DVD layer is 38.6%.If the reflectivity Rb2 of the described HD DVD layer that is formed by described high reflectivity film is 88%, flashlight Ibs is exactly 9.2% (=0.944 of described incident light Ib
2* 0.8 * 0.386
2* 0.87 * 100%).In addition, the noise light Ibn from described DVD layer is 34.4% (=0.944 of described incident light Ib
2* 0.8 * 0.482 * 100%).
If described birefringence is pressed into 40nm, identical with described CD-RW birefringence, the amplitude that is reduced by described birefringence is exactly 9.3%, and the aforementioned calculation value can multiply by 1.13.So described flashlight Ibs is set to 10.4%, described noise light Ibn is set to 38.9%.
=layer-to-layer signal transfer and middle layer=
Next step will consider the thickness in layer-to-layer signal transfer and middle layer.In Fig. 8, when using described red laser to reproduce described DVD layer 81, see through reflection on the light described HDDVD layer 83 thereon of this layer, and see through described DVD layer 81 once more.Reproduction optical system has described DVD layer 81 is imaged on effect on the photodetector surfaces.Therefore, on described HD DVD layer 83 the noise light Irn of reflection to the contribution of described photodetector be described intermediate layer thickness square.
In described single-surface double-layer DVD CD shown in Figure 4, the minimum thickness value in described middle layer is set to 40 μ m.Use this value, the level that described layer-to-layer signal transfer is set can not cause problem.In addition, to the reflectivity that described first recording layer 21 is determined, make the light approximately equal from described two-layer reflection of setting.
As shown in Figure 8, if use described red laser beam 30 to reproduce described DVD layer 81, described noise light Irn from described HD DVD layer 83 is 15% of a described incident light so, 45% 1/3 (15/45) (birefringence: 60nm) of the described flashlight Irs that promptly described DVD layer 81 sends.This value shows that although the thickness in described middle layer is reduced to 23 μ m (=40 μ m/ √ 3) from its minimum value 40 μ m, described layer-to-layer signal transfer is constant.
Next step, as shown in Figure 9, if use described bluish violet color laser bundle 65 to reproduce described HD DVD layer 83, so described flashlight Ibs is 9.2% of a described incident light.Simultaneously, described noise light Ibn is 34.4% of a described incident light, promptly is 3.74 times of described flashlight Ibs.According to the regulation of the standard of described HD DVD, the minimum thickness value in described middle layer is 15 μ m.Therefore, for described noise light is reduced to equivalent level, the minimum value in described middle layer can be set to 29 μ m (=15 μ m * √ 3.74).Specifically, if the thickness in described middle layer within the scope of 29 μ m to 47 μ m, described layer-to-layer signal transfer just can not cause problem.
Under actual conditions, the bonding precision among the described HD DVD also can be improved to about ± 3 μ m.Because the minimum value in described middle layer is improved to about 19 μ m, the thickness with described middle layer under the preferable case is arranged on about 40 ± 5 μ m.
=flag information=
Next step will introduce the flag that described CD is set according to the embodiment of the invention.Described DVD layer 81 needs to treat as normal single-surface single-layer DVD.So (BP2) of physical format information is set to described single-surface single-layer CD in ID in the Frame and the control data zone.
Simultaneously, for described HD DVD layer 83, (BP2) of physical format information is set to described single-surface single-layer CD in ID in the Frame and the control data zone.
Under the preferable case, the described CD that indicates according to the embodiment of the invention has two-layer---comprising described DVD layer and described HD DVD layer---flag has been used in the control data zone the some reservations position in (BP2) disc structure in the physical format information.In layer type, there are two reservation positions (b7 and a b3) not use.These positions not only keep in ROM, are also keeping in rewritable, R type etc.Therefore, these positions are regarded as not influence.
(BP2) compact disk structure
B3 0b keeps
The 1b ground floor is the DVD layer, and the second layer is a HD DVD layer
=realize by the compact disk equipment of dvd standard reproduction=
Next step will introduce the situation of using conventional DVD equipment to reproduce the CD of the embodiment of the invention with reference to Figure 10, Figure 11 A and Figure 11 B.Figure 10 has shown the primary structure of the conventional DVD equipment of knowing.Figure 11 A and Figure 11 B have shown its operational scheme and focus servo.
When described conventional DVD equipment had been packed described CD 70 of the present invention into, spindle motor 100 rotated to predetermined number of revolutions.Next step allow that the cycle drive current flows into focusing ACT 116, and shaven head moves up and down vertically.So the focus signal 206 that produces from reproducing signal occurs periodically.From the focus signal level of described DVD layer is from described HD DVD layer signal level three times big.Therefore, most of DVD equipment are single-surface single-layer DVD CD with this optical disc recognition, and open the focus servo to described DVD layer, as reference signs 207 indications.
So of short duration was provided with after the time, focuses on and be set (210).Open tracking servo subsequently, and carry out tracking (211) in the appropriate location of described CD.In this state, the ID in the read data frame (220), and check area type, reflectivity, level number of described CD etc.After this, drive radially ACT 117, move to the Lead-In Area (221) of described CD.When moving to the control data zone of described CD (222), just read the number of plies (BP2) and layer type in the physical format information, and to examine described CD be described single-surface single-layer DVD CD.Reproduce DVD image (223) subsequently.
Depend on the equipment difference, exist following situation: although the signal level of described HD DVD layer is low, described CD is judged as single-surface double-layer DVD CD, and has read described HD DVD layer.Yet,, will attempt once more on described DVD layer, to focus on, so that read described DVD layer owing to can't obtain prearranged signals from described HD DVD layer.Therefore, can not go wrong.
=realize by the compact disk equipment of HD dvd standard reproduction=
Next step will introduce the situation of the HD DVD equipment that uses the bluish violet color laser bundle with reference to Figure 12, Figure 13 A and Figure 13 B.At first, allow that the cycle drive current flows into focusing ACT 116.After this, identified two recording layers, and to identify CD according to its level differences be CD of the present invention according to focus signal.In this case, the gain (230) of control reproducing signal, and on described HD DVD layer, carry out focusing (240).Of short duration was provided with after the time, and focusing is set.Subsequently when opening tracking servo (241), the tracking state is set in position.
Subsequently, the ID in the read data frame (250), and check area type, reflectivity, level number of described CD etc.After this, drive radially ACT 117, move to the Lead-In Area (251) of described CD.When moving to the control data zone of described CD (252), just read (BP2) b3 in the physical format information, the number of plies and layer type, and to examine described CD be described single-surface single-layer DVD CD.Reproduce HD DVD image (253) subsequently.
=realize by the compact disk equipment of compatible DVD and HD dvd standard simultaneously reproduction=
Next step will refer to figs. 14 and 15, introduce according to compatible equipment of the present invention, it had both used red laser beam also to use the bluish violet color laser bundle.In this compatible equipment, described bluish violet color laser Shu Shouxian focuses on the CD, and drives focusing ACT 116.
Afterwards, according to focus signal, judge that described CD is CD of the present invention (203).After this, the gain (230) of control reproducing signal, and on described HD DVD layer, carry out focusing (240).Open tracking (241) subsequently, the ID in the read data frame (250) moves to the Lead-In Area (251) of described CD, and reads the physical format information (252) in the control data zone.According to the b3 flag of (BP2) compact disk structure layer type, examining is CD of the present invention.Check subsequently level number and the layer type, and identify current just access the layer be exactly described HD DVD layer.Therefore reproduce HD DVD image (253).
Secondly, when the user uses input terminal 190 to select DVD (191), just control the gain (205) of reproducing signal, on described DVD layer, carry out focusing on (210), open tracking (211), and the ID in the check data frame (220).Subsequently, move to the Lead-In Area (221) of described CD, the flag (222) in the check control data zone, and reproduce the DVD image.If described user selects HD DVD (192), use the method for above explanation can reproduce HD DVD image (253).
As mentioned above, on a slice CD, can form DVD and HD DVD according to the present invention.In existing DVD equipment, reproduce described DVD layer, in the described HD DVD equipment of described HD dvd standard correspondence, reproduce described HD DVD layer.In compatible equipment according to the present invention, can either reproduce described DVD layer and also can reproduce described HD DVD layer.In in conjunction with the product of described existing dvd standard and new HD dvd standard product, also can promote to issue steadily the product of described HD dvd standard to the general user.
=other embodiment=
In above embodiment, introduced the situation that forms the semitransparent thin film of described first recording layer by the Ag alloy.Yet,, just can realize performance more efficiently if reflectivity and transmissivity to two kinds of laser beam with different wave length can selectively be set.
For example, if described first recording layer is formed by interactional multilayer film etc., can be set to be higher than the reflectivity of described second laser beam (bluish violet color laser bundle) for the reflectivity of described first laser beam (red laser beam), described in addition first recording layer can be set to be higher than its transmissivity to described first laser beam to the transmissivity of described second laser beam.
Although at length introduced the preferred embodiments of the present invention, should be pointed out that and wherein can make multiple change, replacement and replacement and do not break away from defined, the spirit and scope of the invention of subsidiary claims.
Claims (10)
1. single-side double-layer light disk comprises:
Photic zone;
First recording layer by the first laser beam access;
The middle layer; And
By second recording layer of the second laser beam access,
Wherein, described photic zone, described first recording layer, described middle layer and described second recording layer are sequentially arranged on the laser beam incident direction,
Described euphotic thickness, promptly the distance from plane of light incidence to described first recording layer is 550 μ m to 575 μ m,
The thickness in described middle layer, the distance between promptly described first and second recording layers is 29 to 47 μ m, and
The area recording density of described second recording layer is three times of area recording density of described first recording layer at least.
2. according to the CD of claim 1, wherein, described first recording layer to the reflectivity of described first laser beam more than or equal to 45%, and described second recording layer to the reflectivity of described second laser beam more than or equal to 8%.
3. according to the CD of claim 1, wherein, described first recording layer to the reflectivity of described first laser beam greater than the reflectivity of described second recording layer to described second laser beam.
4. according to the CD of claim 1, wherein, described first recording layer to the transmissivity of described second laser beam greater than the transmissivity of described first recording layer to described first laser beam.
5. the compact disk equipment of reading and recording information on CD comprises:
Shaven head is configured to produce first laser beam and second laser beam; And
Controller is configured to make described shaven head optionally to produce any in described first laser beam and described second laser beam,
Wherein, described CD has photic zone, first recording layer by the described first laser beam access, middle layer and by second recording layer of the described second laser beam access,
Wherein, described photic zone, described first recording layer, described middle layer and described second recording layer are sequentially arranged on the laser beam incident direction,
Described euphotic thickness, promptly the distance from plane of light incidence to described first recording layer is 550 μ m to 575 μ m,
The thickness in described middle layer, the distance between promptly described first and second recording layers is 29 to 47 μ m,
The area recording density of described second recording layer is three times of area recording density of described first recording layer at least.
6. according to the compact disk equipment of claim 5, wherein, described controller is configured to the input by user interface according to the user, selects in described first laser beam and described second laser beam any a branch of.
7. according to the compact disk equipment of claim 5, wherein, described controller is configured to select described second laser beam the initial procedure that reads information from the CD test of receiving.
8. according to the compact disk equipment of claim 6, wherein, described controller is configured to select described second laser beam the initial procedure that reads information from the CD test of receiving.
9. according to the compact disk equipment of claim 7, wherein, in the time of can reading information in described initial procedure, described controller keeps selecting described second laser beam, imports by described user interface until described user, indicates and selects described first laser beam.
10. compact disk equipment according to Claim 8, wherein, in the time of can reading information in described initial procedure, described controller keeps selecting described second laser beam, imports by described user interface until described user, indicates and selects described first laser beam.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004279847A JP2006092702A (en) | 2004-09-27 | 2004-09-27 | Optical disk, optical disk apparatus |
| JP2004279847 | 2004-09-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1755814A true CN1755814A (en) | 2006-04-05 |
| CN100466078C CN100466078C (en) | 2009-03-04 |
Family
ID=35500995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100845668A Expired - Fee Related CN100466078C (en) | 2004-09-27 | 2005-07-27 | Optical disc and optical disc device |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US7688702B2 (en) |
| EP (1) | EP1640982A3 (en) |
| JP (1) | JP2006092702A (en) |
| KR (1) | KR20060051131A (en) |
| CN (1) | CN100466078C (en) |
| TW (1) | TW200623102A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006164325A (en) * | 2004-12-02 | 2006-06-22 | Memory Tec Kk | Optical disk, optical disk apparatus, optical disk reproducing method, and digital work publication |
| JP2006164366A (en) * | 2004-12-06 | 2006-06-22 | Toshiba Corp | Optical disk, optical disk apparatus, and optical disk reproducing method |
| JP2007080303A (en) * | 2005-09-09 | 2007-03-29 | Toshiba Corp | Information recording medium and optical disk apparatus |
| EP2006854A4 (en) * | 2006-04-13 | 2009-10-21 | Pioneer Corp | Information reproducing device and method, and computer program |
| CN102027540A (en) * | 2008-05-14 | 2011-04-20 | Lg电子株式会社 | Recording medium, recording method and recording device, and playback method and playback device, for long-term data storage |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH056571A (en) | 1991-06-28 | 1993-01-14 | Pioneer Electron Corp | Optical type information storage medium |
| JP3008819B2 (en) * | 1995-05-31 | 2000-02-14 | 日本ビクター株式会社 | optical disk |
| PL181642B1 (en) * | 1995-09-08 | 2001-08-31 | Philips Electronics Nv | Optical multiple-layer information carrier |
| KR100242129B1 (en) | 1997-06-18 | 2000-02-01 | 윤종용 | Optical disk satis fying plural standards |
| KR19990020314A (en) | 1997-08-30 | 1999-03-25 | 윤종용 | Disc and disc recognizing method and disc reproducing apparatus having multiple recording surfaces of different recording densities |
| US6931654B1 (en) * | 1997-08-30 | 2005-08-16 | Samsung Electronics Co., Ltd. | Hybrid disc and method and apparatus for discriminating same |
| JP3968485B2 (en) | 1998-04-09 | 2007-08-29 | ソニー株式会社 | Multi-layer disc playback apparatus and multi-layer disc playback method |
| JPH11328735A (en) * | 1998-05-13 | 1999-11-30 | Sony Corp | Optical disk and optical pickup for the disk |
| US6469965B1 (en) * | 1998-10-02 | 2002-10-22 | Sony Corporation | Apparatus for and method of playing back optical disc |
| GB9906762D0 (en) * | 1999-03-25 | 1999-05-19 | Philips Electronics Nv | Optical disc player |
| US6650612B1 (en) * | 1999-03-31 | 2003-11-18 | Matsushita Electric Industrial Co., Ltd. | Optical head and recording reproduction method |
| JP4192373B2 (en) | 1999-12-10 | 2008-12-10 | 日本ビクター株式会社 | optical disk |
| JP2002257134A (en) | 2001-02-28 | 2002-09-11 | Nsk Ltd | Rolling bearing unit for swing arm and manufacturing method thereof |
| JP3867589B2 (en) * | 2002-02-22 | 2007-01-10 | ソニー株式会社 | Initializing method of optical recording medium |
| JP2004013947A (en) * | 2002-06-04 | 2004-01-15 | Victor Co Of Japan Ltd | Information recording carrier, device and method for reproducing, for recording, and for recording/reproducing |
| JP2004071046A (en) | 2002-08-06 | 2004-03-04 | Ricoh Co Ltd | Optical multi-layer information recording disk, optical pickup device, and optical information recorder/reproducer |
| US7443778B2 (en) * | 2003-02-27 | 2008-10-28 | Matsushita Electric Industrial Co., Ltd. | Optical head device and optical information device using the same, computer, optical disk player, car navigation system, optical disk recorder, and optical disk server |
| KR100494475B1 (en) * | 2003-05-21 | 2005-06-10 | 삼성전기주식회사 | Optical pick-up and optical write and read apparatus using thereof |
| JP2006164325A (en) * | 2004-12-02 | 2006-06-22 | Memory Tec Kk | Optical disk, optical disk apparatus, optical disk reproducing method, and digital work publication |
-
2004
- 2004-09-27 JP JP2004279847A patent/JP2006092702A/en active Pending
-
2005
- 2005-06-24 TW TW094121261A patent/TW200623102A/en unknown
- 2005-06-29 US US11/170,560 patent/US7688702B2/en not_active Expired - Fee Related
- 2005-07-27 CN CNB2005100845668A patent/CN100466078C/en not_active Expired - Fee Related
- 2005-08-23 EP EP05255170A patent/EP1640982A3/en not_active Withdrawn
- 2005-09-09 KR KR1020050083946A patent/KR20060051131A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| KR20060051131A (en) | 2006-05-19 |
| CN100466078C (en) | 2009-03-04 |
| JP2006092702A (en) | 2006-04-06 |
| EP1640982A2 (en) | 2006-03-29 |
| TW200623102A (en) | 2006-07-01 |
| US20060092820A1 (en) | 2006-05-04 |
| EP1640982A3 (en) | 2006-06-07 |
| US7688702B2 (en) | 2010-03-30 |
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